admin: Use abbreviations for all model filters

Normally, we would like to name our model filters more verbosely: e.g.
proj --> project, net --> network. However, django-filter fails to
understand that the filter we create has nothing to do with the actual
model field and crashes, if defined like so:

    project = django_filters.ChartFilter(..., action=my_action)

If we try to circumvent like so:

    proj = django_filters.ChartFilter(..., name='project',
                                      action=my_action)

then no results are printed since the query gets incorrectly cleared by
the FilterSet form.

There doesn't seem to be an easy or clear way to circumvent this issue
so, for now on, in order to be consistent across views we use as filter
names the abbreviations of their model names.
admin: Update instructions and Tips and Tricks

Update the instructions of Compact Filters View as well as the Tips and
Tricks. The update consists mainly of rewording some phrases or adding
extra context about the Compact Filters.

Also, fix some minor issues, such as missing colon in filter labels etc.